package com.example.testaudio; import java.io.File; import android.app.Activity; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Menu; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity {  private MediaRecorder recoder = null;  private MediaPlayer player = null;  private String theMediaPath;  TextView tv = null;  TextView tvRecord = null;  Button testBtn = null;  Button testBtn2 = null;  Button stopBtn = null;  Button playBtn = null;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   tv = (TextView)findViewById(R.id.textView1);   tvRecord = (TextView)findViewById(R.id.tvRecord);   testBtn = (Button)findViewById(R.id.button1);   testBtn2 = (Button)findViewById(R.id.button2);   stopBtn = (Button)findViewById(R.id.buttonStop);   playBtn = (Button)findViewById(R.id.buttonPlay);   testBtn2.setOnTouchListener(new OnTouchListener() {    @Override    public boolean onTouch(View v, MotionEvent event) {     Log.i("testactivity", "setOnTouchListener:"+event.getAction());     switch(event.getAction()) {      case MotionEvent.ACTION_UP: {       Log.i("testactivity", "停止录音");       stopRecording();       break;      }      case MotionEvent.ACTION_DOWN: {       Log.i("testactivity", "开始录音");       startRecording();       break;      }      default: break;     }     return false;    }   });      testBtn.setOnClickListener(new OnClickListener() {    public void onClick(View arg0) {     startRecording();     testBtn.setEnabled(false);     stopBtn.setEnabled(true);    }   });   stopBtn.setEnabled(false);   stopBtn.setOnClickListener(new OnClickListener() {    public void onClick(View arg0) {     stopRecording();     testBtn.setEnabled(true);     playBtn.setEnabled(true);     stopBtn.setEnabled(false);    }   });      playBtn.setOnClickListener(new OnClickListener() {    public void onClick(View arg0) {     playRecordFile(theMediaPath);     stopBtn.setEnabled(true);    }   });  }  protected void playRecordFile(String _file) {   try {    File f = new File(_file);    if(!f.exists()) {     tv.setText("文件不存在:" + _file);     return;    }   } catch(Exception e) {    Log.i("testactivity", e.getMessage());   }   try {    player = new MediaPlayer();    player.setDataSource(_file);    player.prepare();    player.setOnCompletionListener(new OnCompletionListener() {     public void onCompletion(MediaPlayer arg0) {      tv.setText("播放完毕");      stopBtn.setEnabled(false);     }    });    player.start();   } catch(Exception e) {    Log.e("testactivity", "play failed:" + e.getMessage());   }  }  /**   * 停止录音处理   */  protected void stopRecording() {   if(recoder != null) {    Log.i("testactivity", "停止录音");    recoder.stop();    recoder.release();    recoder = null;    endtime = System.currentTimeMillis();    _handleRecordComplete();   }   if(player != null) {    Log.i("testactivity", "停止播放");    player.stop();    player.release();    player = null;   }  }    /**   * 开始录音处理   */  protected void startRecording() {   theMediaPath = Environment.getExternalStorageDirectory().getAbsolutePath();   theMediaPath += "/audiotest.3gp";   recoder = new MediaRecorder();   recoder.setAudioSource(MediaRecorder.AudioSource.MIC);   recoder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);   recoder.setOutputFile(theMediaPath);   recoder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);   starttime = System.currentTimeMillis();   updateMicStatus();   try {    recoder.prepare();    recoder.start();    _handleRecordStart();   } catch (Exception e) {    Log.e("testactivity", "prepared failed:" + e.getMessage());    _handleRecordStartError(e);   }  }  //定时器  private static long maxtime = 30*1000; //30秒  private long starttime = 0l;  private long endtime = 0l;  private final Handler mHandler = new Handler();      private Runnable mUpdateMicStatusTimer = new Runnable() {          public void run() {           //判断是否超时          if(starttime > 0 && System.currentTimeMillis() - starttime > maxtime) {           Log.e("testactivity", "超时的录音时间，直接停止");           stopRecording();           return;          }          //更新分贝状态             updateMicStatus();          }      };      /**      * 更新话筒状态 分贝是也就是相对响度 分贝的计算公式K=20lg(Vo/Vi) Vo当前振幅值 Vi基准值为600：我是怎么制定基准值的呢？ 当20      * * Math.log10(mMediaRecorder.getMaxAmplitude() / Vi)==0的时候vi就是我所需要的基准值      * 当我不对着麦克风说任何话的时候，测试获得的mMediaRecorder.getMaxAmplitude()值即为基准值。      * Log.i("mic_", "麦克风的基准值：" + mMediaRecorder.getMaxAmplitude());前提时不对麦克风说任何话      */      private int BASE = 600;      private int SPACE = 300;// 间隔取样时间     private void updateMicStatus() {          if (recoder != null) {              // int vuSize = 10 * mMediaRecorder.getMaxAmplitude() / 32768;              int ratio = recoder.getMaxAmplitude() / BASE;              int db = 0;// 分贝              if (ratio > 1)                  db = (int) (20 * Math.log10(ratio));                          _handleRecordVoice(db);             mHandler.postDelayed(mUpdateMicStatusTimer, SPACE);              /*              * if (db > 1) { vuSize = (int) (20 * Math.log10(db)); Log.i("mic_",              * "麦克风的音量的大小：" + vuSize); } else Log.i("mic_", "麦克风的音量的大小：" + 0);              */          }      }    private void _handleRecordStart() {   //开始录音的接收函数   tv.setText("开始录音...");   //starttime 开始时间  }  private void _handleRecordStartError(Exception e) {   //开始录音的接收函数失败   tv.setText("开始录音失败:" + e.getMessage());  }  private void _handleRecordComplete() {   //结束录音   tv.setText("停止录音:" + theMediaPath);  }  private void _handleRecordVoice(int _db) {   //声音事件侦听，转换成分贝   tvRecord.setText(""+_db);  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {   // Inflate the menu; this adds items to the action bar if it is present.   getMenuInflater().inflate(R.menu.main, menu);   return true;  } }